Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant's customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. As an Amazon Associate we may earn from qualifying purchases. We may receive a commission from purchases made through links on our site, which will help us continue to provide you with value.
Household Sensors & Alarms Categories
Best Choice Daytech 
DAYTECH Door Alarm Sensor Volume Adjustable Door Open Sensor Chime 0-120 dB Window Alarm with 4 Modes for Kids Safety De Volume Adjustable Door Alarm: This door and window alarm is used to alert you when a door or window is opened by 0-120DBFinestHouse 
Door Window Alarm, 90dB Loud Security Sensor for Home Security, Kids & Pool Safety - for Homes, Offices, Hotels, Apartme 【Easy Installation】The magnetic sensor triggers when the door or window opens. Features simple peel-and-stick setup withBest Value Mengshen 
Mengshen Motion Sensor Alarm, Wireless Doorbell Alert for Front Door Door Entry Driveway Mailbox Home Shop Visitors with Wireless Motion Sensor: Remote transmission, 280 meters in the open place, suitable for more places,Winhon 
Motion Sensor Alarm,Wireless Motion Detector Door Chime Doorbell for Home Store Business,Caregiver Reminder for Elderly, 【Application】Home Use: Get real-time alerts when someone approaches your house, monitor patient care activities, or keepDogxiong 
4 Pack Security Window/Door Alarm, Door Open Chime, Magnetic Burglar Alert Sensor, Loud Door Alarms for Kids Safety, DIY Big LOUD ALARM – door window sensors loud enough to detects entry, prevent kids and babies going out the house, protectiDaytech 
DAYTECH Door Alarm Sensor Window Alarms Volume Adjustable Door Open Chime 0-120 dB Window Alarm with 4 Modes for Kids Sa Volume Adjustable Door Alarm: This door alarm is used to alert you when a door or window is opened by 0-120DB alarm or dDaytech 
Daytech Door Sensor Chime Entry Alert Chime Wireless Door Window Open Alarm with 5 Volume Levels for Home Store Apartmen How This Door Open Sensor Alarm Works: Door sensors are devices that let you know when someone has opened a door. Door sDaytech Daytech Door Sensor Chime Entry Alert Chime Wireless Door Window Open Alarm with 5 Volume Levels for Home Store Apartmen How This Door Open Sensor Alarm Works: Door sensors are devices that let you know when someone has opened a door. When dSECRUI SECRUI Wireless Door Chimes When Entry for Business/Home/Office/Store (500ft Range 32 Chimes Adjustable Volume) Door Ope Easy to Install: The SECRUI door sensor installation operation is simple and does not require the use of any wiring or sDaytech DAYTECH Motion Sensor Door Chime Wireless Door Sensor Chime, Motion Sensor Doorbell Bed Alarms for Elderly Dementia Pati OUT OF THE BOX : The door sensor chime has been programmed before shipped. Plug the receiver into the outlet,here we go.Daytech Daytech Door Sensor Chime Entry Alert Chime Wireless Door Window Open Alarm with 5 Volume Levels for Home Store Apartmen Door Chime with Long Battery Life: 1 Receiver with 1 door sensor. This door sensor designed with ultra-low power consumpAiBest AiBest Home Alarm (12 pcs) - Wireless Magnetic Sensor, 95 dB Burglar Alarm for Doors & Windows Super loud 95 dB alarm. When someone opens the door or window illegally (the relative position of the primary and secondHojellyTek Ultrasonic Level Sensor with 2.4G WiFi,Non-Contact Liquid & Solid Level Monitor,Tuya Smart & Smart Life APP Remote Contr Real-time remote monitoring via dedicated APP, check liquid/solid level data anytime and anywhereDaytech DAYTECH Door Alarm Sensor Volume Ajustable Door Open Chime 0-120 dB Window Alarm with 4 Modes for Kids Safety Dementia P Volume Adjustable Door Alarm: This door and window alarm is used to alert you when a door or window is opened by 0-120DBCHUSHEN Solar Motion Sensor Alarm Outdoor Solar Alarm 120dB Loud Siren LED Strobe Lights Sound Security Alarm Adjustable Sensing 🥁 Solar Energy Alarm Light: this solar alarm strobe light can frighten away intruders and thieves by siren and strobe lHepzest Hepzest Smart Life Leakage Sensor Water Leak Detector Water Linkage Alarm App Remote Monitoring Water Leak Detector 2. A water immersion sensor that detects water leakage in the environment in real time.Whenever and wherever you are, onDaytech DAYTECH Wireless Motion Sensor Alarm Indoor Motion Detector Alarm, Bed Alarms for Elderly Dementia Patients, Motion Sens Portable Motion Sensor Door Chime: Say goodbye to battery worries. The receiver is powered by a built-in rechargeable ba21% Off Actpe Motion Sensor Doorbell for Business Entry, Store Welcome Buzzer Monitor, Outdoor Door Chime Kit: Infrared Motion Sensor ❤️ 【Easy, Fast, Wire Free Installation】 Infrared sensor detects motion and sends a signal to the receiver. Chose from 36Goerpn 2 Pack Ultra Slim Window Alarm - 130dB Vibration Sensor for Security - Glass Break Alert for Home, Office, Dorm Room, RV 【Ultra Thin Window Alarm】A slim, modern shock sensor alarm designed for windows and doors.Mengshen Mengshen Door and Window Alarm, Anti-Theft Burglar Wireless Alarm with Remote Control for Home Security, Easy to Install Home Security Alarm: Super loud alarm of 105dB, scare thief away,METAK 5 Pack Water Leak Detectors for Home, 100dB Water Sensor Alarm for Basement, WD60 Flood Leakage Detection Devices for Pi Leaking & Dripping: 2 water sensitive probes on the front for monitoring pipe/drain drip and 4 rear probes for detectionSECRUI SECRUI Door Chime, Wireless Door Alarm Sensor with 500ft Range 32 Chimes Adjustable Volume Mute Mode LED Indicators – Do Easy to Install: The SECRUI door sensor installation operation is simple and does not require the use of any wiring or sJectse Water Leak Alarm, 85 DB Household Wireless Water Leak Detector Sensor 9V,ABS Plastic,Flood Spot - Next to Bathrooms, Bas Automatic and high sensitivity. Once its three contactor touches the water, it will immediately send out a 85 dB alarm.meross meross Matter Smart Presence Sensor, 3-in-1 mmWave Radar & PIR & Light Motion Sensor, AI Motion Detector for Home Automa Radar+PIR+Light 3-in-1 Sensor: Combines PIR and millimeter wave radar to detect both motion and human presence (even witLancoon Lancoon WiFi Water Leak Detector with App Alerts Adjustable 100dB Alarm Smart Home Device with 6.5 Feet Detection Line f 💧【Dual Alarm Modes】Either via 100dB audible alarm on the body or via instant app notification via Smartlife/Tuya app (wEPTTECH EPTTECH Smart TLC 2326-WF-S Tuya APP Efficient Solar Panel Rechargeable Battery Liquid Level Monitor WiFi Water Oil Tank LONG MEASURING DISTANCE: 10cm to 2.9m(4 to 114 inches) from the sensor, which is suitable for different tanks.Generic Generic WiFi Smart Alarm Siren for Home Security System with Alexa Control Alarm Sensor Temperature Humidity 3IN1 100dB [Dual Power Supply & Linkage Function] Remain protected with backup battery power. link with other smart home devices foOEBUAFI OEBUAFI USB/Battery Powered Infrared Doorbell Alarm MP3 Player for Motion Sensor Detection [RELIABLE SAFETY] with human body induction up to 4 meters.UanTii UanTii Tuya WiFi Smart Door Window Alarm Sensor Open Closed Detectors Smart Life APP Reminder Compatible with Alexa Goog 【App control】No hub required; Works with Smart Life/Tuya App; When you leave home, it will push notification message toMeichoon Meichoon Motion Sensor Alarm Wireless Detector Home Security Alert System Doorbell for Front Door Indoor Room Entry Driv ✨Expandable Wireless Home Security - Independent alarm horn,maximum 113dB, can effectively scare the thieves and intrudeBetterlink 1/2 Mile Long Range Solar Wireless Driveway Alarm System IP65 Weatherproof Outdoor Motion Detectors&Sensor 120dB Siren S Easy to install and expand: This wireless solar driveway alarm system is easy to install. It can be installed on walls,Generic Motion Sensor Alarm, Portable Motion Detector for Camping, 125dB Loud Noise Maker, Security Alarm Device, Survival Gear Revolutionized Security: Ensure comprehensive protection by activating the alarm with 3 quick presses, enter arming modePrice Xes Home Security Alarm System DIY Kit - Magnetic Sensor - Guardian Protector - Window Glass Vibration Security Burglar Alar ✔Magnetic sensor switch detects entry protecting your home or office whether you are in or out.CPVAN CPVAN 125dB Loud Motion Sensor Alarm with 328ft Remote Control (40ft PIR Detector, Batteries), Indoor Wireless Infrared Super Loud and Easy to Use👉 CPVAN Motion Sensor Alarm is designed with 125dB alert device and simple operation, which c15% Off SwitchBot SwitchBot Door Alarm Contact Sensor - Smart Home Security Wireless Window Alarm and Door Sensor, Add SwitchBot Hub Mini [Window & Door Alarm Sensor for Home Security] SwitchBot Contact Sensor can detect the opening/closing of doors and windS SELDORAUK S SELDORAUK Motion Sensor, PIR Dog Barking Alarm Door Chime Alert Guard Doorbell Wireless Infrared Detect Device Wall Mo 【6 Realistic Dog Barking & 11 Voice】Our Alarm has 11 Doorbell Ring chime including 6 barks and 1 alarm, 2 ding dongs, 110% Off meross meross Smart Water Detector with Hub, Smart Water Alarm with App Alert, Water Leak Detector Replaceable Batteries, Wirel Meross Hub Required - Package does not contain hub. Please get a Meross hub first. Meross offers a variety of smart prodDaytech DAYTECH Freezer Door Alarm with Delay 1/2/3/4 mins When Left Open Window Chime Close Doors Reminder Refrigerator Door Al Freezer Door Alarm When Left Open: When the alarm and magnetic sensor are separated by more than 0.6inch(1.5cm), The ala11% Off Yasao WiFi Door Alarm Window Sensor Detector Smart Home Security Tuya SmartLife App Control Compatible Amazon Alexa Google Ass ?[【Enjoy Your Smart Life】When you leave home, it will push notification message to you when the door/window opens or cloGeneric Bed Wetting Alarm Children, Wireless Bedwetting Alarm, 3 Modes, 80 dB Sounds and Vibration, USB-C Rechargeable Enuresis 【Wireless Design】The sensor and receiver are separate, eliminating any cumbersome connection cables. The moisture sensorBoundlessBrothers Natural Gas Detector WiFi,Propane Natural Gas Leak Detector for Home Kitchen, Combustible & Explosive Gas Alarm for LPG, 【EN 50194 Certified – Maximum Safety】 Trusted gas detector for home, garage, camper, or commercial spaces. Monitors methMengshen Mengshen WiFi Water Leak & Water Level Detector, 2-In-1 Tuya Smart Sensor Alarm Loud Volume APP Alert Monitoring with 6. 💧【Dual Sensor Water Alarm】2 in 1, including water leak probe and water level probe. It can not only detect water leaks,Lancoon Lancoon 2 Pack Door Window Vibration Sensor Alarm 130dB Adjustable Sensitivity Alarm Warehouse Security Sensor for Home 🔔【Adjustable Sensitivity Levels】Our vibration alarm features 5 sensitivity settings, allowing you to customize the alerLICAEVEY Human Presence Sensor, Adjustable 24GHZ Motion Detection, Millimeter Wave Presence Sensor for Ceiling Light Switch, Dete Advanced: The presence sensor adopts microwave induction technology, which can realize intelligent light control and eneeMagTech eMagTech Water Leak Sensor Water Leak Sensor Detector 120dB Water Leak Alarm Detector Water Overflow Alarm Detector for Powerful Alarm: Boasting an ear-piercing 120dB alarm sound, the device ensures attention and action. The alarm persistsSYNLETT SYNLETT Bed Alarm Caregiver Pager with Wireless Motion Sensor Alarm Indoor Fall Prevention for Elderly Monitoring Senior PORTABLE BED ALARM DEVICE: The portable bed alarms and fall prevention for elderly device is applicable at various areas31% Off SABRE SABRE Wired Water Leak Flood Alarm Sensor with 110 dB Siren - DIY Easy Installation PERSONAL PROTECTION YOU CAN TRUST: SABRE is the #1 pepper spray brand trusted by police & consumers & a leader in the pezauzau Zauzau Water Leak Detector, Zigbee Water Detector Sensor for Home, Battery Operated Water Alarm, Zigbee Hub Required, Su Real-time water leak detector —This intelligent water leak detector is equipped with a high-sensitivity sensor. High senLancoon Lancoon Cordless Water Detector 100dB WiFi Alarm Place Anywhere Leak Sensor for Bathroom Kitchen Under Sink Battery Oper 💧【Instant Dual Alerts】Our WiFi water leakage alarm features a loud 100 dB siren combined with Tuya app notifications, eUanTii UanTii Smart Water Leak Alarm Sensor Tuya WiFi Water Leak Detector Flood Detector with 100dB Loudly Alarm Sound Works wi [APP Remote Control] Works with Smart Life/Tuya Smart App; Receive alarm push remotely at any time through the mobile phSYNLETT SYNLETT Caregiver Pager 2 Wireless Call Buttons 1 Motion Sensor Alarm Indoor for Elderly Monitoring Fall Prevention Bed PORTABLE CAREGIVER PAGER: This wireless caregiver pager system comes with 2 wireless call buttons, 1 motion sensor alarmUanTii UanTii Tuya WiFi PIR Motion Sensor Movement Detector Alarm Smart Life APP Wireless Home Security System Compatible with 【APP Remote Control Tuya WiFi Motion Sensor】Simple download APP "Smart Life/Tuya Smart" in App Store or Google Play addActpe Motion Sensor Doorbell for Business Store Entry Alert Welcome Buzzer Monitor Alarm, Outdoor Door Chime Kit for Home - LE ✨【Easy, Fast, Wire Free Installation】 Infrared sensor detects motion and sends a signal to the receiver. Chose from 36 RGeneric Door Alarms When Opened - Wireless Safety Portable,Door Alarms Home Security Window Sensor - for Elderly Personal Indoor Instant Unauthorized Access Warning: The Door Alarm is designed with a sensitive vibration sensor to identify movement p17% Off Eufy EUFY Water and Freeze Sensor Instant Notifications*: Protect your home from leaks, water damage, and damage from freezing temperatures. Get notificatMETAK Water Leak Detector Sensor Alarm: Home Water Flooding Monitor Smart Sink Overflow Monitoring Adjustable Wet Moisture Ale Drip & Leak Alerts: Water leak detector alarm is designed with 4 rear water leakage detection probes and 2 front drip prVYNTEL 6-in-1 Air Quality Monitor for PM2.5/PM10/HCHO/TVOC/CO/CO2, Portable Multifunctional Detector with LCD Screen - Home, Of 6-In-1 Detection: Monitor PM2.5, PM10, HCHO, TVOC, CO, and CO2 simultaneously with one device – no need for multiple detPGST PGST Home Security Systems for House, Wireless Home Security Alarm System, Door/Window Sensor Motion Sensors with App Al The security alarm system consists of:1 control panel (host),1 motion sensors,1 door/window sensors,2 RFID cards,2 remotTOWODE WiFi Alarm Home Security System, Wireless Alarm System with Loud 120dB Motion Sensor Siren, Window Door Alarms Sensor, R WiFi Smart Home Alarm System: The robust WiFi siren hub integrates with the Tuya app via 2.4GHz WiFi, serving multiple sX-Sense X-Sense Wi-Fi Water Leak Detector, Smart Water Sensor Alarm, Water Detector Alarm with 1700 ft Transmission Range for Ki Ready to Use: Download the app, connect the devices to the app via the 2.4 GHz Wi-Fi network (incompatible with 5 GHz) aMETAK Water Leak Detector Sensor Alarm: Home Water Flooding Monitor Smart Sink Overflow Monitoring Adjustable Wet Moisture Ale Drip & Leak Alerts: Water leak detector alarm is designed with 4 rear water leakage detection probes and 2 front drip prWGRLIT Solar Motion Sensor Alarm - 120dB IP65 Waterproof Security Siren with Strobe Light, 3 Modes for Yard/Farm/Home,16-26ft P 【𝐌𝐢𝐥𝐢𝐭𝐚𝐫𝐲-𝐆𝐫𝐚𝐝𝐞 𝐃𝐞𝐭𝐞𝐫𝐫𝐞𝐧𝐜𝐞】 120dB siren combined with blinding strobe lights creates psychologicaKALLORY KALLORY Water Leak Detector Sensor Alarm with Loud Sound and Waterproof Abs Material, No Installation Required, Versatil Immediate alerts: provides immediate alerts when water levels rise, allowing you to take to prevent further damage,waterRisinglink Risinglink Smart Water Level Monitor, WiFi-Enabled, Text/Email Alerts, Indoor/Outdoor Detector, Battery Powered, Stainle NO HUBS, APPS, OR MONTHLY FEES: Easy WiFi setup with no hub, no app, no subscription, and no monthly fee—just connect anYUNFANG WiFi Door Sensor, WiFi Door Alarm Window Sensor Detector Smart Home Security Tuya SmartLife App Control Compatible Alexa ?【Enjoy Your Smart Life】When you leave home, it will push notification message to you when the door/window opens or closRUIKORING WiFi Water Leak Detectors for Home 3 Pack, Wireless Smart Water Leak & Drip Alarm, 120dB Adjustable Loud Water Leak Sens Portable Design & Easy Installation: Our smart water leak detector sensors features a compact design, allowing for easyCHUSHEN Smart Window Door Magnet,WiFi Door Alarm Window Sensor Detector Smart Home Security Tuya SmartLife App Control Compatibl 🥁 【Enjoy Your Smart Life】When you leave home, it will push notification message to you when the door/window opens or clGeneric Solar Powered Alarm Strobe Light with Motion Sensor Alarm Human Body Induction Infrared Alarm Light Anti-Theft Animal Re ✅[Solar-Powered Alarm System] : This alarm system is powered by a 5V130mA monocrystalline silicon solar panel, providingAzdBvae High / Low Water Level Alarm Sensor Detector Not - Overflow, Water Alarm for Sump Pump w/ 120 dB Strobe Siren, Water Lea 【High and Low Dual Probe Sensoe Design】- It can detect water shortage(low level) or overflow(hige level). You can chooseGROZY WiFi PIR Motion Sensor Tuya Smart Life App Control Wireless Infrared Detector Home Security Burglar Alarm System Motion Detection: Detect status of moving accurately within 6m/19.68ft range, providing real-time alerts for enhanced hoBETTERINMETA Wireless Bedwetting Monitor for Children, Adults & Elderly – Night Potty Training Aid for Boys, Girls & Older Kids 【First-Time Charging】: Connect the diaper sensor and wireless bed wetting alarm to the magnetic charging cable and charEPTTECH EPTTECH Smart TLC2326P Remote Detector Display Screen Tuya Smart Life Mobile APP Liquid Water Oil Fuel Level Tank Monito 30% Off KOQICALL KOQICALL Solar Alarm Moiton Detector 120 dB Adjustable Volume Strobe Light Audible Security Alarm IP65 Waterproof Outdoo 【Two Charging Methods】The mobile detector is powered by rechargeable lithium battery. The mobile detector can be chargedJectse Jectse Ultrasonic Water Level Meter, Wireless Digital Tank Level Indicator with High Low Alarm IP65 , for Home Farm Indu [Ip65 Weatherproof Design] Built to withstand harsh outdoor conditions, the level sensor transmitter features an ip65 ra23% Off UanTii UanTii Tuya WiFi Door Window Detector with Light Sound Alarm Wireless Door Alarm Sensor for Home Security Smart Home Doo 【No hub required】The window Door alarm sensor works with directly Tuya Smart/Smart Life App and Alexa Google Home, no huFafeicy Fafeicy Alarm Beam Sensor IP55 Waterproof Infrared Gate Beam Detector Adjustable Low Battery Reminder Wireless for Indoo Durable Structure: Infrared gate beam detector is made from superior ABS, wear resistant and durable, the transmitter isWuloo Solar Driveway Alarm Wireless Outside 1800ft Range, Outdoor Motion Sensor & Detector Driveway Alert System with Recharge Reliable & Dependable: 1/3-mile long range (1760 ft.; 536m) tested in real-world settings with trees, buildings, walls,Spacnana High Efficiency Water Leak Alarm Detector 120dB, Multi Scenario Water Level Alarm for Kitchen Leaks, Solar Heaters [High Efficiency Water Level Alarm] : This alarm efficiently detects overflow and leakage, ensuring home safety and saviintendvision Gas Leak Detector - Natural Gas Detector Portable Handheld Gas Sniffer with Audible & Visual Alarm, Sensitivity Adjustab 【Portable Gas Leak Detector】This portable pen type gas leak detector can detect a large number of flammable gases, likeGaoducash WiFi Motion Sensor Alarm: Smart PIR Motion Detector Alert with 110dB Siren & App Alerts, Tuya App for Remote Arm/Disarm, SMART MOTION ALARM: Whenever unexpected motion is detected, the smart motion sensor will send an alert to your phone viaShurzzesj Shurzzesj Water Sensor Alarm Leak Detector - Water Leakage Detection Monitor Alarm Device For Home | Loud Water Leak And Excellent Leak Monitoring: This water leak detector for home is able to detect a slow drip from a pipe or an overflowingYoLink YoLink Smart Home Starter Kit: SpeakerHub & Water Leak Sensor 4 with 105dB Audio Alarm 3-Pack, SMS/Text, Email & Push No Comprehensive Leak Detection Kit: Get started with the YoLink SpeakerHub Leak Detection Starter Kit, featuring one hub aHTZSAFE Extra Solar Wireless Outdoor Weatherproof Motion Sensor/Detector for HTZSAFE Alarms-1/4 Mile Wireless Transmission Range NOTE PLEASE-It is the extra solar wireless motion sensor which is compatible with HTZSAFE wireless alarm system; the senCHICIRIS CHICIRIS Door Sensor, 120db Loud Alarm Touch Sensitive Security Sensor ABS Plastic Black for Home Apartment Office Renta [CONVENIENT PROTECTION] - Hang the touch sensor on the inside of your door handle for instant security without the needXUMIUZIY Wireless Vibration Alarm, Door/ Open Alarms, 120dB High Tone Alarm Sound, Home Security Sensor, Anti-Theft Alarm for Hom 120DB ALARM SOUND: Wireless door alarm will sound a high pitched alarm up to 120dB upon detecting a vibration, scaring aWakects Wakects STC-1000 Digital Temperature Controller -50°C to 99°C Alarm Intelligent Thermostat LED with Sensor AC110V-220V Switch the modes between cool and heat, support both cool andEPTTECH EPTTECH Smart TLC2326 Tuya Liquid Level Monitor APP Oil Water Indoor IP65 Alarm Sensor Household Indicator Ultrasonic We LONG MEASURING DISTANCE: 10cm to 2.9m(4 to 114 inches) from the sensor, which is suitable for different tanks.ARTIBETTER ARTIBETTER Water Leak Detector Alarm Sensor for Home Loud Sound Water Level Alert for Basements Fish Tanks and Pools Acc Detector for home: its installation is easy and straightforward, without any complicated steps, for basementCryfokt Wireless Door Alarm Versatile 4 Modes 108 DB Door Alarm Sensor Multifunctional Window Open Alarms with Remote Control, G [VERSATILE ALARM FOR MULTIPLE APPLICATIONS] This wireless door alarm can be used for various doors, such as swimming pooLancoon Lancoon Door Alarm with Remote 2 Pack, Wireless Home Security Window Open Magnetic Sensor Burglar Alert for Home Garage 🚪 105dB Loud Alarm: Alarms can be mounted on all kinds of doors and windows. Once triggered, loud alarm will effectivelLancoon Lancoon 2 Packs Anti-Theft Vibration Alarm, 110dB Loud Sensitivity Adjustable Motion Sensor Burglar Safety System for Do 🚲 Anti Theft Alarm: Once triggered, 110 db loud alarm can be a great deterrent for thieves. It is suitable for doors, wLancoon Lancoon Water Leak Alarm with 1.1m Probe 65-120dB Adjustable Sound Stainless Steel Sensor Low Battery Alert for Basement 💧【Advanced Water Detection Technology】Our water detector alarm features a 1.1-meter immersion detection line and stainlGeneric RV Propane Gas 85dB Loud Alarm 12V Compact Design with Digital Display for Trailer Camper Motorhome Motorcoach Easy Installation: Simple to install and set up in your RV without the need for professional assistance.Mengshen Mengshen Wireless Bicycle Motorcycle Alarm, Waterproof Anti-Theft Security Sensor Alarm with 113dB Super Loud Sound, 7 L Mini Size: 3.7in * 1.6in, Compact with creative designHTZSAFE Driveway Alarm System- HTZSAFE 1/2Mile Solar Driveway Alarm System- Up to 70FT Wide Sensor Range- Fully Weatherproof Out Solar Wireless Alarms- The outdoor weather resistant solar motion sensor is powered by built-in rechargeable battery, anTapo Tapo H500 HomeBase 16GB Built-in Memory Expandable up to 16TB Supports 16 Tapo Cameras & 64 Sensors Local Storage HDMI 5 Local storage without monthly fees: Built-in 16GB eMMC memory, expandable up to 16TB via an additional 2.5" SATA HDD/SSDFilfeel FILFEEL Portable Counter Radiation Dosimeter with Beta Gamma Alarm, USB Rechargeable Compact Detector for Home Travel 【Detection】- Experience extremely accurate radiation measurement with our Mueller tube technology. Very reliably captureEvoDevice Car CO2 Meter with Voltage Display – Rotatable Color Screen, High-Accuracy Sensor, Over-Limit Beep Alarm, Plug-in for 12 Real-Time CO₂ Meter. Equipped with a high-precision CO₂ sensor, this device continuously tests in-cabin air quality. IdePKCELL CR123A 3V Lithium Battery,Non Rechargeable Lithium 123 Battery 1500mAh for Cameras keyless Locks Alarm Smart Sensors Pho 【High Capacity】: CR123A lithium batteries have high capacity（Rated capacity 1500mAh) ,and low discharge. Storage life up